Avoid warnings in Attribute\Value\Value::getAttributeKey
Avoid warnings in Attribute\Value\Value::getAttributeKey

MichaelMaar/concrete5,avdevs/concrete5,TimDix/concrete5,MichaelMaar/concrete5,matt9mg/concrete5,avdevs/concrete5,matt9mg/concrete5,matt9mg/concrete5,TimDix/concrete5,TimDix/concrete5,MichaelMaar/concrete5,avdevs/concrete5